Dothideomycetes » Dothideomycetes, genera incertae sedis

Polycyclinopsis

Polycyclinopsis Bat., A.F. Vital & I.H. Lima, in Batista & Vital, Revta Biol., Lisb. 1(3-4): 284 (1958).

 Index Fungorum number: IF 4311; Facesoffungi number: FoF 12421, 1 morphological species (Species Fungorum 2022), no molecular data available.

Foliar epiphyte on upper surface of leaves forming black rounded spots. Mycelium superficial, not apparently penetrating host cells. Sexual morph: Thyriothecia circular, gregarious, superficial, carbonaceous, brown-black, basal peridium poorly developed, rupturing and forming a star-shaped central pore at maturity; in section lenticular. Upper wall comprises irregularly arranged radiating cells which are branched at the outer rim, from which mycelium strands develop. Peridium comprising a single stratum, cell layers of textura prismatica, outer cells black-brown, inner cells light-brown. Hamathecium comprising asci embedded in mucilage inclined towards the center, pseudoparaphyses not observed. Asci 8-spored, bitunicate, fissitunicate, subglobose, globose or saccate, apedicellate, without a distinct ocular chamber, bluing in IKI. Ascospores multi-seriate, ellipsoidal, hyaline when young, pale brown when mature, two-celled, verruculose. Asexual morph: Unknown (adapted from Wu et al. 2011).

 Type species: Polycyclinopsis solani Bat., A.F. Vital & I.H. Lima

Notes: Polycyclinopsis is characterised by circular, gregarious, superficial, carbonaceous, brown-black thyriothecia, subglobose, globose or saccate, apedicellate asci and ellipsoidal, hyaline, two-celled ascospores. Lumbsch and Huhndorf (2010) and Kirk et al. (2013) accepted Polycyclinopsis in Microthyriaceae. Wu et al. (2011) examined the holotype specimen of P. solani (URM 2471–2472 EXS: 1238) and excluded Polycyclinopsis from Microthyriaceae since it lacks a distinct ostiolar pore as in Microthyrium. Polycyclinopsis resembles members of Asterinaceae in having ascomata that opens by rupturing of the central upper ascomatal wall. Wu et al. (2011) and Wijayawardene et al. (2017, 2020) also referred Polycyclinopsis to Dothideomycetes genera incertae sedis. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the systematic position of Polycyclinopsis.

 

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